Typewriting machine



3311.2, 1923. f 1,440,703. A. W. SLMITH.

TYPEWRITING MACHINEl FILED DEC. 2| i921.

(huma Patented Jan. 2, 1921.3.

Anemia W. SMITH, or NEW Yoeri, N. Y.,

Fier.

assit-triton vTo .earn-Noach -ffrnwnrrnn oor/Irans?, or Intron, NEW YORK, n ooaronnfrron Jor New YORK'.

TYPWMTING MACHINE.

Application filed December 2, 1921. Seria-1 No. 519,402.

To al! whom 'it fin-ty oon-067%.'

io it known that l, ARTHUR WV., SMITH, citizen ol1 the Unite:AV States, .and .resident of the borough of lt/lanhattan, .city of New York. in the county of New York and State of New York, have invented certain new and useful improvements in rrlypewrit'ingg iiachines, `of which the following is .a .specih'cation.

My invention relates .to -typewriting `rnachiues, .and more particular-lg7 to cushion stop inea-ns for noiselessly arresting a inorahle part, such as the space lroy ofthe Inaohfi'ic,

(ne vof the main ohiects of lmy invention, in ierally stated,y is to provide simple and "i cient ineens of the character specified.

More specificallysta-ted, the objects Vof the invention are:

To cushion .the impact of a movable part in such a inanner that no noise results in effecting an arrest thereof.

2nd. To proviifle means of the character stated in which the spring or cushion vstop (,ters no resistance .to the .operating -inovement of the he); or movable `part which it arrests until at about the time when Sucharrest 'to be effected.

3rd. To cai'ise the cushion means .to coact with the movable part in such a mannervas to counteract any lateral movement or vibration of the movable part during' the operation thereof, and thus Aprevent a rattling of the movable part and any noise that might result therefrom.

To the above and other ends which will hereinafter appear my invention -consists in the features of construction, arrangements of parts and combinations -of devices set forth in the following `description and particularly pointed out in the appendedclaims..l

in the accompanying- -draw-innjs wherein like reference characters yindicate corresponding' parts in the different views,

Figure l is a detail fragmentary transverse Vertical sectional View showing' the space hey and Sonie of the associated parts, including the inea-ns for arresting the space lier: the Asection being taken on the line l-l of Fifi- 2 and looking in the direction ofthe arrow at said line.

Figure?. a fore-and-aft .rertical sectional View of the same .taken on a line 2 2.

of Fig. V"l and looking in the direction ofthe arroiiy .at said line.

Figure 3 isa-n enlarged detail fore-andwaft vertical vsectional. View showing some of the parts illustra ted in the preceding iigures, .the section being taken .on -the `line 3 -3 of Fig. l and .looking in .the direction .of the arrow atsaid line.

Figure 4 .is a like View ofthe saine/showing; the s ace key depressed.

Figure .5 is a .detail face View of fone ofthe ears on'the fra-me by which ya spring .stop is supported, the View .corresponding to .a .section taken on the .line of Fig. 3 and :looking in `the direction of the arrow v-at said line. I l

In .the present instance I have shown my` invention embodied .in a` typewriti-Iig` 2machine of thecharacter disclosedin the patent to Aff? Dudley, Nro'. 1,39f/a6layelated.October 25, i1v l .to arrest `the space key., though .the invention may he 4used .in connection with to a rock shaft 5. 'The latter is mounted at its ends .to turn in hearing` openings .in

fragmentary `naside y bracket plates .Gsecured :to the frames 7 .of l

the rnachine. Attached .to the rrock shaft `5, to the left of a point .midway in ythelength thereof, is .a rear-wardl5fY and upwardly eX- tending arm S, This arno is Ifixed to the shaft, or vto .a `lined -cylindrical 1enlargement 9 thereof, by a yclamping yoke 10 formed on the `arm S. The arms of .the `yoke l0 are drawn together hy .a screw 1l tov connect thel arm S .to turn with .the rock shaft.` The rear end of the arm .8 contacts w'iththe ltail of a'` member .12 which controls the dog rocken and vthe .operation of the `escapeinent from the space-hey. A leaf spring 13 1s secured at one end. by a screw 14C to a vfixed part 'of` .the machine `and hears downwardly against f of' the be etlected.

rested, which in the present instance is the space key l, is limited in its movements both away from and-back to normal position'by the novel cushion lstop means ot my invention. ln the construction as illustrated, two

such cushion stops are employed, one

each end of the space key. Each cushion stop comprises a metallic coiled spiral spring l5 preferably conoidal in form and anchored at one end, and having its axis extending transversely of the path or movement oit and beneath the space key. l prefer to anchor each spring l5 at its small end only to a fixed part. suitable supporting screw lG having conoidal or beveled head 3 7. The screw is passe-d through the central opening at the larger end oi the associated springl so that the stem of the screw may pass through the contracted opening at the small end thereot. rlhis enables the head of the screw to engage the convolutes of the spring near its contracted end and anchor the spring in place, leaving the larger end tree to be fles-:ed laterally. rlhe stem of each screw 16 passes through a slightly enlarged opening TLS (see Fig. 5) in a depending ear 19 tori'ned in the present instance as a. part ot the base traine i', and spaced apart from the front cross bar-7a thereof. ln the space between each ear 19 and the front cross bar 7 is received a nut 2O in which the stem-ot the associated screw 16 vis threaded, to iirn'ily `clamp one end of the spring in place by the action of the head of its screw thereofi. ,lhe slightly enlarged opening 18 for each screw 16 enables a limited lateral adjustment of the screw and spring stop carried thereby 'to l prefer to surround each spring with a sleeve-like pad 2l of felt or like material to further aid in eilecting a noiseless arrest ot the key. Preferably the pad or sleeve 2l conforms substantially to the contour of the spring which it surrounds. As shown herein l have formed integral with each ot the lrey levers la depending inwardly directed hoolr-lilre contact or stop member 22 which conforms to the contour 03C. the associated spring stop member at the largest diameter thereof, so as to contact therewith, or with the pad carried thereby,' at the under side and limit the upward or return movement oie the space lrey, as shown in Fig. l.. As will be understood more particularly .trom 1a consideration ot this rlast mentioned ligure, the inner side ot each space hey leveru 23, constitutes a ver- .tically disposed contact iace or member adapted to coact with the outer side of the associated spring stop. The construction is such that normally the stop springs exert no lateral torce against the contact taces'r However, it in theoperation ,ot the space key there should be any tendency thereoi2 to move or vibrate laterallyq or in the direcvhey.

F or this purpose l provide al tion of length7 this would tend to move the members 23 laterally and such tendency would be resisted by the stop springs; one resisting the lateral movement in one direction7 and the other resisting such movement in the opposite direction. The etl'ect oi this is to prevent any rattling oi the space hey and its mounting7 and any noise that might result therefrom. without however retarding or resisting the operating movement of the rllhe downward movement oi the key l, or its movement away from normal position7 is limited by the stop springs. Thus the upper tace ot' the pad 2l9 at the larger end et each spring l5, coacts with a bottom contact tace 2e formed by the lower face of the space key to arrest the depression of the key, as shown in F ig. Ilhe space lrey in its operating or downward movement is free from the resistance ot the springs l57 such resistance not being brought into action until at about, or

just before7 the point in the depression oliA the hey where the arrest thereof is to be etected. rlhe tension o1 the spring l5 is preferably such, that inthe ordinary operation of the space key but little it any lateral detlection ci the springs is brought about, depending somewhat on the operators touch. This may be better understood when it is explained that ordinarily tl e machine is adjusted to allow a drop7 or feed of the carriage under the operation of the space key when the latter reaches, say7 about one-halt the extent oi' its depression, although, of course, this adjustment may be varied. Some opcraters2 in practice, effect such a dip of the key that arrest thereol2 may be brought about by the stop springs without vflexing the latter9 whereas otheroperators may have a long following stroke on the space key, continuing a pressure thereon at the last part ot the strole. Even with a stroke sucl as that .last referred to, the resistance ot the springs is preferably such that each spring` will be but slightly flexed, say `trom a position such as that indicated in dotted lines in Fig. el, to the itull line postion represented in said figure, which latter may be supposed to represent the full extent of the dip ot the hey. ln every instance lthe amount of resistance of 'the springs is such that it will eil'ect an ol the key.

The shape of each spring l5 and the relation that it bears tothe key are such that small co-operative contact surtaces are presented by the stops or arresting means, especiallv in arresting the downward movement ot the lrey. Thus it will be seen that the conoidal lorm of each spring, mounted -in the manner indicated, enables practihat practically a tore-andati; line Contact ispresented between each iace E24 and a Small part at the rear end Oithe associated pad 21. So therefore no broad, iiat surfaces are presented to slap, one againstanother. in the returnra'ovement oi: the lkey to normal position, the members 22 likewise exert their torce only 'against the cnlarged coils oi: tree ends ci: thcspringg's vi re the comparatively small surfaces off the pads, vindicated at Qlniay Contact at the under side thereof with said members From the foregoing, it will be understood that the stop spring devices of my invention are simple in construction and inexpensive to mai'iuitact-ure, thatl they may be readily applied Vto various styles ot typewriting machines; that they are effectiveA in noiselessly' arresting the key in its movements both away from and back to normal position 2 without resisting the operatingY movement oit the key, and are efiective to prevent a lateral vibration and possible' incidental rattling 'noise of the ky,*and the mounting' thereto-r during operation.

`What l claim as new and desire` to secure by Letters Patent, is z y l. 1n a ty'pewriting machine, the combination of a movable part, and a coiled stop spring` tor arresting' the movementV of said movable part, said spring being disposed with its axis extending transversely of the path ot' the movable part and exerting a lateral resistance sufficient to arrest the movable parta 2. 1n a typewriting, machine, the combination ot a key, and a conoidal stop springfor arresting the movement o t said key, the force of the key being exerted tiret against the larger coils and laterally oit said spring.

ln a typewriting machine, the combination ot a conoidal stop spring, and a part which is arrested in its movement by said springr but is free in its movement from normal position troni the' resistance or" said spring' until the arrest of thev part is about to be effected, the torce of said part being exerted rst against the latter portion of said spring.

' el. ln a typewritingmachine, the combination otl conoidal stop spring; anchored only at its smaller end, and a. key which is arrested by said spring but is tree in its movenient trom noi-mal position trom the resistiance ot said spring);` until the arrest ot said part is about to be effected, the spring; being; eiigageable vhrst at its free endiand transversely of the spring.

5. ln typewriting machine, the combination of a movable part, and a coiled stop spring; which coacts therewith and effects arrest ot said partin its movement both from and back to its normal position.v

6. in a typewri ing machine, the combination of' movable partn a. coiled stop s f-iring' which coacts therewith and effects an arrest 'ot said part linlits movement both from `and .back to its normal position, and

padding int ioeetl betweensaidspringand'` n Table part to aid 1n noiselesslyeitecting nient.

ation ot" key, andrineans for noiselessly arresting the movements of said key away from and back to normal position, said ieans comprising a ycoiled stop spring, a

member cari ed by said "key and anormally bearing 'against said spring to4 limit the re- -iirn movement 'oll the key,1an'd a stop `face onfsaid kcywhich coacts with said spring only the lastparto its vcmerating move.- n'ient to limit the mov nent'ot the key from' normal posii' atyp writing machine, the 'combination ci? a key, and means 'for noiselessly arcombie. .in a.typewriting inachi'ne-the combi-V resting saidkey said means comprising two.

stop springs'l,` means which coact therewith to y arrest the key, and means Which coact with said springs to enable the latter to resist a deflection of the key laterally from its path of movement. f

10. ln a typewriting machine, the combination of a key, and means for noiselessly arresting; said key,lsaid means comprising `two stopv springs, means which coact with each of said stop springs to arrest thel key in its movement trom and also in its movement back to normal position, and means which'v coact with said springs to enable the latter .L to resist a deflection ot the key laterally from its path oit movement.

ll. ln a typewriting machine, the combination of' a key having; stop faces that are spaced apart, and a `coiled stop spring anchored only at one lend and-yieldable in opposite directions 'from its-normal position of rest, said spring being: interposed between said stop faces and cti-operating; with one of them tolimit the motion of the key in one direction and cooperating with the other stop tace to limit the motion 'oit the key in the opposite direction.

12. ln a typewrit' nation o'la key havi machine, the combig stop aces that are spaced. apart, a stop "spring interposed be-I tie-reen said stop faces and co-operatiiia` with one ot them to limit the motion ofthe key in one direction andv {3o-operating; .with the4 other stop tace to limit the motion of the key in the opposite direction, the operating movement of the key from normal position being free from the resistance of said spring, and paddinginterposed between said stop faces and spring, whereby thearrest of the key Will be noiselessly eiected at the limit oi its movement in both directions.

13. ln a typewriting machine, the combination of a space key, a ypair of hook-like stop members carried bysaid key, a pair of stop. springs each normally engaged from beneath by one of said hook-like stop members to limit the return movement of the key, and a pair of stop faces on said key, each impacting` against oneolf said springs on the upper side thereo'to limit the down stroke 'of the key. l

i 14C. In a .typewritingmachine, the combination of a space key, a pair of hook-like stop members carried by saidkey, a pairvo'f stop springs each normally engaged from beneath by one of said hook-like stop members to limit the return movement oi the key, a pairk oi stop faces on said key, each impacting *againstone of said springson the upper side thereof to'limit the downstroke of the key, upright contact members which co-act 'with said springs onopposite sides thereoie to resist a lateral deflection or rattlingo the key in its movements, yand padding interposed iailioos betweensaid springs and the parts which co-aet therewith to nrther ald in electing a noiseless arrest or the key in its movementsy in both directions.

i5. ln a typevvritingmachine,` the combination of a key, and a `coiled stop spring an-` chored only at one end and the resistance of which limits the movement of the keys in both directions and offers no resistance to the operatin` movement of the key until an arrest of the latter' is about to be effected.

i6. ln a ty'sewriting machine, the combination of a key, a coiled stop spring an'- chored only at one end and the resistance of which aids in guiding the key and Which limits its movement both away from and e back to normalposition, and offers no resist,`

ance to the operating movementof the key until an'arrest of the latter is about to be effected, and means by Which a bodily adjustment of said stop spring` may be eected.-

Signed at the borough of Manhattan, city of New Yorlnin the county of New York and State or" New York, this lst day of Dec., A. D. 1921. i v

n kernen W. snrrn.

l-itnesses: i

@Hannes E. SMITH, t E. M. WELLS. 

